JPH0532248Y2 - - Google Patents

Description

[Detailed explanation of the idea] [Industrial application field]

This invention relates to the improvement of routers with cross rails such as machine tools and woodworking machines, and particularly relates to routers that are improved so as to be able to correct distortion of the cross rails.

[Conventional technology]

Fig. 4 is a front view of a conventional NC-controlled router, and Fig. 5 is a side view of the same. A plurality of parallel guide rails extend, and a table 3 for mounting a workpiece is movably mounted on these guide rails 2. This table 3 is equipped with means for suctioning and fixing the mounted workpiece, and is adapted to be driven to travel on the guide rail 2 by a driving means such as a servo motor. Reference numeral 4 denotes columns that stand up on both sides of the bed 1, and these columns are connected to a cross rail 5 that straddles the table 3 above and extends in a direction perpendicular to the running direction of the table 3 (plane Y-axis direction). Supports both ends. A saddle 7 driven by a servo motor 6 is mounted on the cross rail 5 via a slide bearing guide rail 8 (see FIG. 5). Further, the saddle 7 is equipped with a spindle head 10 via an elevating base 9, and this spindle head 10
has an end mill (processing blade) 11 and constitutes a processing means for a workpiece. In addition, 11a is a cutting powder scattering prevention cover. The elevating base 9 is driven up and down by a servo motor 12 mounted on the saddle 7. Next, the operation will be explained. With the workpiece mounted and fixed on the table 3, the servo motors of the three systems of the table operate under NC control, so that the table 3 travels on the guide rail 2 in the X-axis direction of the plane. In connection with this, the servo motor 6 of the saddle 7 traveling drive system and the servo motor 12 of the elevating drive system of the elevating base 9 are operated sequentially under NC control. As a result, the saddle 7 is driven to travel along the cross rail 5 in the Y-axis direction, and the main shaft head 10 is driven up and down via the elevating base 9. In this way, the table 3, the saddle 7, and the elevating base 9 operate in conjunction with each other under NC control, so that the workpiece on the table 3 is machined by the end mill 11 of the spindle head 10.

[Problem that the idea aims to solve]

The conventional router is constructed as described above, and the cross rail 5 only has a support beam structure at both ends, and the weight of the cross rail 5 and its surrounding components including the saddle 7, lifting base 9, and spindle head 10 are reduced. Since the entire weight acts on the cross rail 5, the cross rail 5 undergoes distortion in the hanging direction due to the total weight and distortion in the twisting direction due to the weight (unbalanced load) of the 10 systems of spindle heads. ,
The distortion increases as the span of the crossrail 5 becomes longer, and due to such distortion, the NC
The running accuracy of the saddle 7 due to the control is impaired, and the saddle 7 operates differently from the NC control command.
As a result, there was a problem in that the machining accuracy of the workpiece on the table 3 was distorted. Therefore, as a measure against the distortion, it is possible to anticipate the distortion in the hanging direction of the cross rail 5 and curve the cross rail 5 upward by the amount of the distortion in advance, but in this case, the processing accuracy may be reduced. Since it is very difficult to remove the material, it is not a countermeasure against distortion that can guarantee the machining accuracy of the workpiece, and there are problems such as a large increase in machining costs. This invention was made in order to solve the above problems, and it is possible to easily and reliably correct the distortion of the crossrail by a simple means.
The purpose is to provide a router that can greatly improve the reliability of machining accuracy through NC control.

[Means to solve the problem]

The router according to this invention straddles a table on which a workpiece is mounted and is driven to travel in the X-axis direction of the plane, and has an auxiliary beam in a hollow cross rail extending in a direction perpendicular to the traveling direction of the table. A distortion correction means is provided for coordinating the auxiliary beam and the cross rail to correct the distortion of the cross rail between the auxiliary beam and the auxiliary beam.

[Effect]

In the router of this invention, the auxiliary beam is housed within the cross rail, and both of them are linked by the distortion correction means, which alone reduces the distortion of the cross rail, and furthermore, the distortion is corrected by the distortion correction means. By being able to easily correct it with means,
The running accuracy of the saddle can be maintained reliably, and highly reliable machining accuracy of the workpiece can be obtained through NC control.

【Example】

An embodiment of this invention will be described below based on the drawings. FIG. 1 is a longitudinal sectional side view showing the main parts of a router according to an embodiment of this invention, FIG. 2 is a longitudinal sectional front view of the main parts, FIG. 3 is a cross-sectional plan view of the main parts, and FIG. The same parts as those in FIG. 5 are given the same reference numerals, and redundant explanation will be omitted. In the figure, the cross rail 5 is made of a rectangular tube material, and the inside near both ends of the cross rail 5 are shown in FIGS.
As shown in the figure, a pair of left and right horizontal shaft type support cylinders 5
a and 5b are provided integrally. An auxiliary beam 13 is housed in the hollow cross rail 5, and this auxiliary beam 13 is made of a square tube having a diameter smaller than that of the cross rail 5, and both ends thereof are supported by the support cylinders 5a and 5b. There is. Here, it is more preferable that the auxiliary beam 13 is supported by the support tube portion 5a or 5b so as to be able to swing up and down (in a swivel shape). A pair of upper and lower drooping distortion correction screws 14a, 14b and a pair of torsion distortion correction screws 15a, 15b are provided at predetermined locations on the cross rail 5 between the support cylinder parts 5a, 5b, respectively. There is. These hanging distortion correction screws 14a, 14b and torsion distortion correction screws 15a, 15b are connected to the cross rail 5 and the auxiliary beam 13, respectively, and are connected to the cross rail 5 between the auxiliary beam 13 and the cross rail 5. It constitutes a distortion correction means for correcting distortion. In the illustrated example, the upper hanging distortion correction screw 14
A has a lock nut N1 and is screwed through the upper wall of the cross rail 5, and the lower end of the screw 14a for correcting drooping distortion abuts and engages with the upper wall surface of the auxiliary beam 13. When the upper hanging distortion correction screw 14a is in contact with the upper wall surface of the auxiliary beam 13,
When further tightened and rotated in the engagement direction, the cross rail 5 threadedly engaged with the drooping distortion correction screw 14a is lifted between it and the auxiliary beam 13, thereby correcting the drooping distortion of the cross rail 5. The distortion correction position is then locked by a lock nut N1. The lower sagging distortion correction screw 14b has a distortion correction nut N2 and a lock nut n2, and passes through the lower wall of the cross rail 5, and the upper end of the sagging distortion correction screw 14b is connected to the auxiliary beam. It is integrally connected to 13. By loosening the lock nut n2 of the lower hanging distortion correction screw 14b, and tightening and rotating the distortion correction nut N2, the cross rail 5 is pushed up from below by the distortion correction nut N2, and the cross rail 5 is lifted up from below by the distortion correction nut N2. Performs the function of correcting the hanging distortion of the rail 5,
At that distortion correction position, it is locked by the lock nut n2. The amount by which the cross rail 5 is pushed up in this case corresponds to the amount by which the upper sag correction screw 14a is lifted. On the other hand, the torsional distortion correction screws 15a and 15b are installed in a state opposite to that of the drooping distortion correction screws 14a and 14b. That is, the upper torsional distortion correction screw 15a has a distortion correction nut N3 and a lock nut n3, and passes through the upper wall of the cross rail 5, and the lower end of the torsional distortion correction screw 15a is connected to the cross rail 5. It is integrally connected to the upper wall of the. The upper torsion distortion correcting screw 15a pushes down the cross rail 5 from above with the lock nut N3 by loosening the lock nut N3 and tightening and rotating the lock nut N3, thereby correcting the torsion distortion of the cross rail 5. It performs a correction function, and is locked at the distortion correction position by a lock nut n3. Further, the lower twisting distortion correction screw 15b has a lock nut N4 and has the same mounting configuration as the above-mentioned upper hanging distortion correction screw 14a. Therefore, the lower torsional distortion correction screw 15b
By further rotating the torsional strain correcting screw 15b itself in the engagement direction with its upper end abutting and engaging with the lower wall surface of the auxiliary beam 13, the torsional strain correcting screw 15b The cross rail 5 that is threadedly engaged with the auxiliary beam 13 is pushed down, and the torsional distortion of the cross rail 5 is corrected by both the lock nut N3 of the upper torsional distortion correction screw 15a. fulfill the function of Next, the operation for correcting the distortion of the cross rail 5 will be explained. First, in order to correct the distortion of the cross rail 5 in the hanging direction, the upper and lower hanging distortion correction screws 14a, 1
By loosening the lock nuts N1 and n2 of 4b and rotating the distortion correction nuts N2 of the upper drooping distortion correction screw 14a and the lower drooping distortion correction screw 14b in the tightening direction, the cross rail 5 is
Push up by the amount of sagging strain. As a result, the hanging distortion of the cross rail 5 is corrected, and the lock nuts N1 and n2 are each tightened at the distortion correction position. In addition, for the distortion in the torsional direction of the cross rail 5, loosen the lock nuts n3 and N4 of the torsional distortion correction screws 15a and 15b, respectively, and tighten the distortion correction nut N3 of the upper torsional distortion correction screw 15a. By rotating each of the lower torsional strain correction screws 15b in the tightening direction, the cross rail 5 is pushed down by the amount of the torsional strain. Thereby, the distortion in the torsional direction of the cross rail 5 is also corrected between it and the auxiliary beam 13. At that distortion correction position, the lock nut n3,
Each of N4 is tightened. By such distortion correction of the cross rail 5,
The cross rail 5 is maintained in a horizontal state. In this state, the saddle 7 will run correctly on the cross rail 5 by the same NC control as in the case of Figs. 4 and 5, so the accurate running accuracy of the saddle 7 can be obtained by the NC control command. As a result, the machining accuracy of the workpiece is significantly improved. In the embodiments described above, the auxiliary beam 13 is not limited to a rectangular tube material, but may be made of other materials, such as a flat steel material, and in this case, the same effect can be achieved. Also, the lock nut N1 of the upper droop correction screw 14a and the droop correction screw 14a,
and the lock nut n2 and distortion correction nut N2 of the lower drooping distortion correction screw 14b, the lock nut n3 and distortion correction nut N3 of the upper torsional distortion correction screw 15a, and the lower torsional distortion correction screw 15b. The lock nut N4 and its torsion distortion correction screw 15b can be automatically controlled to rotate according to a control command signal to correct distortion, or can be replaced with a small hydraulic cylinder, or can be adjusted according to the position of the saddle 7. It may also be a device that corrects and controls the distortion of the cross rail 5, and the same effect can be achieved in either case.

[Effect of the idea]

As described above, according to this invention, by storing and arranging the auxiliary beam within the cross rail and linking both of them with the distortion correction means, it is possible to reduce the distortion of the cross rail with the auxiliary beam alone. However, since the distortion of the cross rail can be easily corrected by the distortion correction means, the distortion of the saddle running on the cross rail of the router can be easily corrected.
Strict running accuracy can be obtained through NC control, and therefore, the workpiece can be processed with high precision through NC control, and the reliability of the processing is greatly improved.

[Brief explanation of drawings]

Fig. 1 is a longitudinal sectional side view showing the main parts of a router according to an embodiment of this invention, Fig. 2 is a longitudinal sectional front view of the main parts, Fig. 3 is a cross-sectional plan view of the main parts, and Fig. 4 is a conventional router. FIG. 5 is a front view showing the NC-controlled router, and FIG. 5 is a side view of the same. In the figure, 3 is a table, 5 is a cross rail, 7 is a saddle, 10 is a spindle head (processing means),
11 is an end mill (processing means), 13 is an auxiliary beam,
14a and 14b are screws for correcting drooping distortion (distortion correcting means), 15a and 15b are screws for correcting torsional distortion (distortion correcting means), and N2 and N3 are nuts for correcting distortion (distortion correcting means).

Claims (1)

[Scope of utility model registration request] A table on which a workpiece is mounted and driven to travel in the X-axis direction of the plane, a hollow cross rail that straddles the table above and extends in a direction perpendicular to the traveling direction of the table, and is supported by the cross rail. In the router, the router is equipped with a saddle that is driven to run and run, and a spindle head that is mounted on the saddle and is driven up and down and serves as a processing means for processing the workpiece. A router comprising: a beam; and a distortion correcting means that links the auxiliary beam and the cross rail at a predetermined location and corrects distortion of the cross rail between the auxiliary beam and the auxiliary beam.